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7604711 |
Method to optimize temperature profiles displacement batch cooking
Method and apparatus for batch displacement digester systems to increase tank farm vessel temperatures for more efficient delignification rates by mitigating the formation of flow channels in the...
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7575657 |
Method and apparatus for reducing the amount of sludge produced in a pulp and/or paper mill
Method and apparatus for reducing the amount of sludges produced in a pulp and/or paper mill. The sludge produced in a pulp and/or paper mill as a result of waste water treatment is conveyed to...
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7560059 |
Process and method for recycling cigarette butts
A process and method for recycling cigarette butts is disclosed. The process and method involves reacting ground cigarette butts with a solvent and mineral spirits and then shaping and drying the...
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7553394 |
Method for removing potassium from ash produced in a kraft pulping process recovery boiler using a Na-type cation exchange organic resin
In the process for producing kraft pulp, performing a potassium ion removal step of flowing an aqueous solution containing ashes recovered from a combustion exhaust gas generated in a black...
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7547374 |
Method for impregnating chips in a continuous digestion system
A method for impregnating chips in a continuous digestion system with an impregnation vessel and a digester. The digestion system has a heat exchanger arranged between a first return line and a...
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7540937 |
Method for continuous cooking
A procedure for the continuous cooking of chemical pulp, comprising an impregnation vessel 101 and a digester 102 . The chips are impregnated in the impregnation vessel 101 and are fed after...
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7396434 |
Catalytic reactor process for the production of commercial grade pulp, native lignin and unicellular protein
A continuous and batch system to produce cellulose, native lignin and unicellular protein from any form of vegetation in a closed process. The biomass is mixed in the impregnate solution of nitric...
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7384501 |
Method for improved turpentine recovery from modern cooking plants
A method for the preparation of pulp by means of alkaline cooking, in which method spent liquor is transferred to pressurized tanks, and at least one liquor is expanded corresponding to a...
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7374637 |
Method of bleaching cellulose pulp with a main conduit for wash liquor and filtrate
The method is for bleaching cellulose pulp in a bleach line that has at least two bleaching steps. The filtrate distribution is led up through the bleaching line counter-currently to the flow of...
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7371307 |
Kraft pulp yield by heat treatment of polysulphide liquors generated by oxidation
Oxidized white liquor is heat treated to increase the concentration of polysulphide measured at 285 or 286 nm (PS UV ) or measured at 416 nm (PS VIS ) and the PS UV /PS GR or PS VIS /PS GR ratio,...
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7300539 |
Treatment of solid containing material derived from effluent
A method of treating solid containing material derived from effluent or sludge from a plant for deinking paper, the material containing calcium in the form of one or more insoluble calcium...
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7294225 |
Process for production of synthesis gas in combination with the maintenance of the energy balance for a pulp mill
A process ( 44 ) for the production of pulp and paper ( 28 ), recycling of cooking chemicals ( 3, 29 ), combustion of biomass ( 30, 37 ) and generation of heat and electric energy ( 27, 40 )...
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7291245 |
Process for causticizing green liquor in chemical recovery from black liquor in alkaline pulping
The improved process is achieved by introducing depuration of green liquor and lime before causticization and two special causticization steps in causticization procedure of conventional chemical...
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7270726 |
Method for the production of green liquor
The method is for production of green liquor in association with a causticizing process during recovery of chemicals in manufacture of sulphate pulp. A smelt ( 14 ) of chemicals principally...
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7270725 |
Pretreatment of chips with white liquor prior to a treatment with black liquor
The method is for the manufacture of cooked cellulose pulp in which the starting material, preferably chips, undergoes a successive increase in temperature towards cooking temperature. This is done...
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7241363 |
Methods to decrease scaling in digester systems
One aspect of this invention relates to a method and digester for reducing the deposition of calcium-based scale in a wood chip digester including extraction from the digester of first and second...
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7214291 |
Method for the modification of cellulose fibres
The invention relates to a method for the modification of cellulose fiber with the object of increasing the strength properties of the pulp. Cellulose derivative, preferably in the form of CMC, is...
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7182835 |
Two-stage chlorine bleaching process with filtrate recirculation
Methods for bleaching chemical pulp are disclosed including dewatering the pulp to a concentration of from 25 to 40%, bleaching in a first chlorine dioxide stage, followed by a second alkaline...
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7172677 |
Method for inhibiting calcium salt scale
Compositions and method for improving inhibition of calcium salt scale formation under the conditions found in chemical pulp processes in which an effective amount of selected phosphonates or...
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7169263 |
Coarse dirt collector for removing coarse material from a pulper and corresponding method
The invention relates to a coarse dirt collector ( 7 ) for removing coarse material from a pulper ( 1 ). The coarse dirt collector ( 7 ) comprises a support arm ( 8 ) with a collecting basket ( 9...
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7060162 |
Chip bin
A chip bin for a digester has an upper part through which chips fall freely from an inlet and a lower part within which the chips remain until they are fed to a digester. Steam orifices strike...
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7029553 |
Urea sulfate and urea hydrochloride in paper and pulp processing
The present invention relates to the use of urea sulfate or urea hydrochloride, or both, in process streams in the paper and pulping industries to control pH, to bring about flocculation or...
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7014684 |
Method for the treatment of waste gas from a cellulose plant
A process and a device for cleaning waste gas from pulp production, especially for cleaning waste gases from a bleaching reactor. Aerosols contained in the waste gas are removed and the gaseous...
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6986828 |
Process for producing low DP microcrystalline cellulose
A process for producing microcrystalline cellulose. The process comprising the following steps:
a) preparation of a pulp by repulping, b) pressing of the pulp obtained in a), c) decompaction...
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6896810 |
Process for producing alkaline treated cellulosic fibers
Systems and methods by which to subject cellulosic fibers to alkaline treatment are provided. The systems and methods of the invention include equipment, such as nanofiltration units and slurry...
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6890404 |
Composition for the production of improved pulp
Compositions and method for improving properties of pulp produced or reducing the digester cycle time in alkaline chemical pulping processes in which an effective amount of at least one selected...
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6869503 |
Composition for inhibiting calcium salt scale
Compositions and method of improving inhibition of calcium salt scale formation under the conditions found in chemical pulp processes in which an effective amount of selected phosphonates or...
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6843885 |
Method for controlling the cooking temperature in a continuous vapour phase digester
The method is for controlling the cooking temperature in a continuous vapour phase digester for chip-shaped cellulose material. A high pressure is established in the vapour phase largely by means...
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6830615 |
High surface area incineration product
The present invention relates to a high surface area product and its production from solid-containing material, such as waste effluent from a paper-treating plant. The high surface area product...
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6821384 |
Process for the treatment of fly ash, using hydrochloric acid
The invention relates to a process for the treatment of fly ash accumulating in the electro-filter of the soda recovery unit in a sulfate cellulose mill, the ash containing primarily Na sulfate, Na...
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6773546 |
Black liquor removed from pulp
Pulp, containing black liquor, is separated to produce pulp substantially free of black liquor. An organic solvent forms a layer within a vessel and adding a pulp containing black liquor will...
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6719879 |
Method for kraft waste reclamation
A method for obtaining particulate calcium carbonate having an average particle size less than about 12 microns is provided. The method includes the steps of (1) withdrawing from a pulp mill a...
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6699357 |
Process for continuous cooking of pulp
The invention relates to a process for continuous cooking of wood chips at elevated pressure and temperature in a vertical digester ( 1 ) for production of chemically dissolved pulp. Fiber material...
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6691358 |
Oxidized white liquor in an oxygen delignification process
The invention refers to a method for an integrated treatment of cellulose pulp. The method includes the steps: providing said cellulose pulp ( 1 ), providing a determined quantity of white liquor (...
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6663749 |
Method for regenerating sodium hydroxide by partial autocausticizing sodium carbonate containing smelt by reaction with borate
A method is provided for the use of borates in the recausticization of alkali-containing liquors such as those produced in the chemical and semi-chemical pulping of wood and in the oxidation and...
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6641699 |
Chemical wood pulping process with reduced pitch and VOC emissions
A chemical wood pulping process having reduced volatile organic compound emissions includes extracting wood particulates with solvent at a pressure less than 50 psi to reduce naturally-occurring...
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6632327 |
Process for treating spent, waste, alkaline digestion liquor from paper pulping operations and product
A water soluble, surface active, polymeric agent is mixed with digestion liquor, preferably with an additional surface active defoamer coagulant agent prior to or during acidification of the...
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6627784 |
Highly efficient method of mixing dissimilar fluids using mechanically induced cavitation
A method of mixing two or more dissimilar fluids such a gas and a liquid is provided. The method includes the steps of introducing one fluid into the other to form a mixture, inducing cavitation in...
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6569284 |
Elemental-chlorine-free bleaching process having an initial Eo or Eop stage
The specification discloses an improved bleaching sequence which provides significant reduction in filtrate volumes and amounts of absorbable organic halide (AOX), color, and chemical oxygen demand...
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6540871 |
Method for processing black liquor sediment
An apparatus and method are provided to reduce the size of solid clumps of material and thereby permit reuse of the material. In particular, the apparatus and method allow for reuse of sediment...
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6517729 |
Oxidation process of the wet oxidation or ozonization type
The present invention relates to a process of oxidation, of the wet oxidation or ozonization type, of a liquid contained in a reactor. The gas of the gas headspace is aspirated into the liquid, and...
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6514379 |
Procedure for arranging water circulations in integrated paper mill
A procedure for arranging water circulations in an integrated paper mill, the paper making process of which having three partly separate process phases concerning the water circulations (I, II,...
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6511578 |
Bleaching and delignifying cellulosic pulp using caroate/caro's acid solution
The invention relates to a method of bleaching and/or delignifying cellulose, in which (a) a sodium hydroxide solution and a peroxydisulphate solution are first of all produced by electrolysis of...
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6503369 |
Process for producing cellulose and fertilizer by-product
The invention relates to a process for producing cellulose and a fertilizer by-product by using a closed cycle of cooking chemicals and process waters. In the process of the invention, the pulp is...
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6425975 |
Process for concentrating soluble and colloidal substances in process waters
The invention relates to a process for enhancing the concentration of the fiber derived dissolved and colloidal substances in process water that comes from mechanical pulping. According to the...
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6425974 |
Process for treating wastewater from a bleach plant
The process according to the present invention relates to the treatment of wastewater discharged from a bleach plant and more particularly treatment of bleach plant alkaline wash filtrate from...
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6372139 |
Circuit purification for the papermaking industry
A method for the treatment of process water or effluent from a papermaking process, in which this water is subjected to at least one anaerobic purification step, an aeration step and a solids...
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6364999 |
Process for producing a wood pulp having reduced pitch content and process and reduced VOC-emissions
Paper and absorbent products having reduced pitch content and enhanced properties, including increased tensile index, tear index, burst index, Scott Bond, smoothness, and stiffness. Further, pulps...
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6350348 |
Batch cooking with black liquor pretreatment
A method of cooking pulp in an alkaline batch process (using one or more batch digesters) improves pulp bleachability. The wood material is supplied to the digester; the cellulosic material is...
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6348129 |
Treatment of pulp mill condensate with ozone
An aqueous stream such as pulp mill condensate containing one or more sulfur compounds is treated by (a) reacting an aqueous feed stream containing TRS contaminant selected from the group...
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